EL817(S)(TD) Equivalent & Substitute Parts

Part Overview

The EL817(S)(TD) is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel device operates in the DC input category with a 4-SMD surface mount package configuration. The component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the primary component experiences supply constraints, extended lead times, or when design flexibility permits selection from alternative manufacturers offering equivalent electrical and mechanical specifications. The Broadcom Limited HCPL-817 series provides direct functional alternatives with compatible isolation voltage, output type, and package geometry.

Key Parameters

Parameter	Value
Manufacturer Part Number	EL817(S)(TD)
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Output Type	Transistor
Input Type	DC
Voltage - Output (Max)	35V
Current - Output / Channel	50mA
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Operating Temperature	-55°C ~ 110°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the EL817(S)(TD) is determined by the following critical parameters:

Mandatory Matching Criteria:

Voltage - Isolation: 5000Vrms
Output Type: Transistor
Input Type: DC
Number of Channels: 1
Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Current Transfer Ratio (Min/Max): Ranges from 50% to 600% @ 5mA across substitute options
Voltage - Output (Max): EL817(S)(TD) specifies 35V; substitute parts specify 70V (higher rating acceptable)
Operating Temperature: EL817(S)(TD) specifies -55°C ~ 110°C; substitute parts specify -30°C ~ 100°C (narrower range acceptable for applications within overlap)
Current - DC Forward (If) (Max): EL817(S)(TD) specifies 60mA; substitute parts specify 50mA (lower rating acceptable if application current requirement is met)
Packaging Format: Tube versus Cut Tape (CT) & Digi-Reel® (different supply formats)

All substitute parts are manufactured by Broadcom Limited and share the HCPL-817 base product number. Rise and fall times (4µs, 3µs), Vce Saturation (200mV), and Voltage - Forward (Vf) (1.2V) remain consistent across all options.

Parameter Comparison

Parameter	EL817(S)(TD)	HCPL-817-30DE	HCPL-817-36CE	HCPL-817-500E	HCPL-817-50AE	HCPL-817-50BE	HCPL-817-50CE	HCPL-817-50DE	HCPL-817-56AE	HCPL-817-56BE	HCPL-817-56CE
Manufacturer	Everlight Electronics Co Ltd	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min) @ 5mA	50%	300%	200%	50%	80%	130%	200%	300%	80%	130%	200%
Current Transfer Ratio (Max) @ 5mA	600%	600%	400%	600%	160%	260%	400%	600%	160%	260%	400%
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	35V	70V	70V	70V	70V	70V	70V	70V	70V	70V	70V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
Vce Saturation (Max)	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
Operating Temperature	-55°C ~ 110°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C	-30°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the EL817(S)(TD). The Broadcom Limited HCPL-817 series components are suitable for direct substitution in applications where the operating temperature range of -30°C to 100°C satisfies design requirements.

Selection by Current Transfer Ratio:

For applications requiring the broadest current transfer ratio range (50% to 600% @ 5mA), select HCPL-817-500E or HCPL-817-50DE. These parts provide identical CTR specifications to the EL817(S)(TD).

For applications with tighter CTR specifications, the HCPL-817 series offers multiple options:

HCPL-817-50AE and HCPL-817-56AE: 80% to 160% @ 5mA
HCPL-817-50BE and HCPL-817-56BE: 130% to 260% @ 5mA
HCPL-817-50CE and HCPL-817-56CE: 200% to 400% @ 5mA
HCPL-817-36CE: 200% to 400% @ 5mA
HCPL-817-30DE: 300% to 600% @ 5mA

Selection by Packaging Format:

HCPL-817-30DE and HCPL-817-36CE are supplied in Tube packaging. All remaining HCPL-817 variants are supplied in Cut Tape (CT) & Digi-Reel® format. Packaging selection depends on procurement and assembly workflow requirements.

Temperature Range Consideration:

The EL817(S)(TD) operates from -55°C to 110°C. All Broadcom HCPL-817 substitutes operate from -30°C to 100°C. Applications requiring operation below -30°C or above 100°C must retain the EL817(S)(TD).

Output Voltage Rating:

The EL817(S)(TD) specifies 35V maximum output voltage. All Broadcom substitutes specify 70V maximum output voltage. The higher rating in substitute parts does not affect compatibility in applications designed for 35V operation.

Frequently Asked Questions (FAQ)

Q: Can HCPL-817-500E directly replace EL817(S)(TD) in all applications?

A: HCPL-817-500E is electrically compatible with EL817(S)(TD) for applications operating within the temperature range of -30°C to 100°C. Both components share identical isolation voltage (5000Vrms), output type (Transistor), current transfer ratio range (50% to 600% @ 5mA), rise/fall times (4µs, 3µs), and 4-SMD package geometry. Applications requiring operation below -30°C or above 100°C must use EL817(S)(TD).

Q: What is the difference between the various HCPL-817 part numbers?

A: The HCPL-817 series variants differ primarily in Current Transfer Ratio (CTR) specifications and packaging format. The suffix letters (A, B, C, D) and numbers (30, 36, 50, 56) designate specific CTR bins and packaging options. All variants maintain identical isolation voltage, output type, rise/fall times, and 4-SMD package configuration. Selection depends on the application's required CTR range and packaging format preference.

Q: Are there differences between Cut Tape (CT) & Digi-Reel® and Tube packaging?

A: Cut Tape (CT) & Digi-Reel® and Tube packaging formats differ in supply presentation and handling. Both formats contain electrically identical components. Packaging selection is determined by procurement quantity, assembly equipment compatibility, and inventory management practices. No electrical or functional differences exist between components supplied in different packaging formats.

Q: What is the significance of the operating temperature range difference?

A: The EL817(S)(TD) operates from -55°C to 110°C, while Broadcom HCPL-817 substitutes operate from -30°C to 100°C. For applications operating within the overlapping range (-30°C to 100°C), either component is suitable. Applications requiring operation at temperatures below -30°C or above 100°C must use EL817(S)(TD) to ensure specified performance.

Q: Can I use HCPL-817-50AE if my application requires a CTR of 50%?

A: No. HCPL-817-50AE specifies a minimum CTR of 80% @ 5mA. For applications requiring a minimum CTR of 50%, use HCPL-817-500E or HCPL-817-50DE, both of which specify 50% minimum CTR @ 5mA.

Q: Is the higher output voltage rating (70V) of Broadcom parts a concern?

A: No. The higher maximum output voltage rating (70V) in Broadcom HCPL-817 substitutes does not affect compatibility in applications designed for the EL817(S)(TD) 35V rating. Higher voltage ratings provide additional design margin and do not impact circuit operation when the actual operating voltage remains within the original 35V specification.

Q: Are all listed parts RoHS3 compliant?

A: Yes. The EL817(S)(TD) and all Broadcom HCPL-817 substitute parts listed are ROHS3 compliant. All components also carry Moisture Sensitivity Level 1 (Unlimited) rating, indicating no special moisture handling requirements during storage or assembly.

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